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TRI-VALLEY GROWERS, THORNTON <br /> ESTIMATE OF PORE VOLUMES PRODUCED THROUGH 5/19/94 <br /> 1) PORE VOLUME CALCULATION <br /> Assumptions: <br /> Original area of contamination approximately 7150 sq ft as shown on site plan. Area of ellipse <br /> = dia.A x dia.B x.7854 = 130' x 70' x .7854 = 7150 <br /> Affected vertical interval for volume calculations is the sand zone below 15'. Little flow is <br /> expected to arise from overlying fine grained material. Average thickness of sand based on well <br /> logs is approximately 8 feet. Effective porosity of sand is 25%. <br /> One pore volume = 7150 sq ft x 8 ft x .25 x 7.48 gallons/cu ft <br /> One pore volume = 107,000 gallons <br /> 2) CUMULATIVE FLOW CALCULATION <br /> Assumptions: <br /> a: - <br /> System has operated for'three years.,{5113191 through 5119/94) _ <br /> Average flow rate has been approximately 2 liters/minute <br /> N <br /> Current flow rate (measured 5119) is 1 gallon/minute <br /> Cumulative flow = 3 yrs x 365 d x 1440 mins/d x 2 1pm x .2642 gpl <br /> Cumulative flow = 833,000 gallons <br /> F . <br /> 3) PORE VOLUMES PRODUCED <br /> 833,000 gallons/107,000 gallons = 7.8 pore volumes <br /> 4) TIME TO PRODUCE A PORE VOLUME AT CURRENT RATE ` <br /> Current daily rate = 1 gallon/minute = 1440 gallons/day <br /> Time required = 107,000 gallons/1440 gallons/day = 74 days. <br />